Jan Rusek composed more than 1,000 problems and asserted his talent in selfmates. He was interested in pawns and promotions: black AUW in this s#3 or white promotions in this s#3 and in echo mates (his 1st Prize in the Pauly MT, 1938-39).
He was an International Judge for selfmates.

Identical twin brothers Yoel and Hillel Aloni are both composers. While Hillel composes studies, Yoel is more a problem composer.
To celebrate their 75th birthday, a composing tourney was organized by the Israeli association for chess composition: of course it requires twin studies.

Hillel's first published chess problem was a helpmate in two and was recalled by Avital Pilpel on his blog.
In The Problemist March 2012 page 373 Yochanan Afek reminded that the Aloni brothers "were highly instrumental in bringing up generations of Israeli composers mainly through their studies and problem columns in the monthly Shahmat and the periodical Variantim. [Yochanan Afek himself] owes a great deal to his dedicated youth mentors and patient guides in the minefields of chess composition."

Alain Pallier is a study composer. He co-authored with Harrie Grondijs a book about R+S studies in 1994: "Knights Ahead!" He is also interested in chess history, especially concerning studies composers, and has written many articles in "Europe-Echecs" and in "EG".
He published many Kings and Pawns studies, but he chose 'heavier' material in his recent successes
Many of his studies are shown, of course, on JMRW's site.